JPH11332465A - Operation of ventilator in raw leaf management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for operating a ventilator in a raw leaf management system capable of mitigating such problems as noise and the voltage drop of an electric source system which might occur in the startup or during operation of the ventilator. SOLUTION: In operating a raw leaf management system in such a way that a plurality of the ducts of a ventilator are situated under an air permeation plate, and raw tea leaves A accumulated on the air permeation plate are ventilated from blowers 5B equipped on the ventilator to dissipate the respiration heat accumulated among the raw tea leaves A and suppress their temperature rise, the startup of the blowers 5B is conducted successively with time lag; thereby, because the power supply to the ventilator does not concentrate at a time, the voltage drop of the electric source system in a tea manufacturing plant can be suppressed, and fire hazards can be excluded as well through suppressing the heat generation of electric source cables, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the operation of a fresh leaf management device, and more particularly to a method of operating a blower that can prevent noise, heat generation, and the like caused by activation of the blower.

[0002]

Background of the Invention Freshly picked green tea leaves carried into a tea factory are stored in a green leaf management room until they are fed into a steamer, which is the first processing equipment. Because the fresh tea leaves are still breathing after plucking, heat is generated by this breathing, and as an example, the internal temperature in a state of being deposited at a height of about 110 cm may be 10 to 15 ° C. higher than the outside air. In some cases, raw tea leaves lose moisture and cause leaf burning (steamed state). In order to prevent such leaf burning and maintain the freshness of the fresh tea leaves, the fresh leaf management device employs a configuration in which air is blown from below the air permeable plate toward the fresh tea leaves deposited on the air permeable plate. .

[0003] By the way, the fresh leaf management device has a pit type,
There are gauge type, automatic container type, etc., regardless of the type, raw tea leaves are piled up while blowing air from below the air permeable plate, and in order to lower the tea temperature as soon as possible, The air has been continuously blown for about one hour after finishing. Thereafter, air is intermittently blown using a timer. For example, in the case of the first tea, the air is blown for 20 minutes and the operation of stopping for 40 minutes is repeated.

[0004] However, due to the configuration of the leaf management device as described above, the following problems have occurred. In other words, the air is blown to the raw tea leaves by a blower equipped with a motor. For example, in the case of an automatic container type, this blower is provided for each of a plurality of blocks that partition the air permeable plate. For example, four units for 300K line,
Eight units for 600K line, 12 units for 1000K line, 16 units for 1300K line, and more tea machines with more than one line in tea factory with more than one line become.

When the blower is started, the motor provided in the blower is several times larger than the rated current flowing transiently.
Inrush current of more than ten times flows, and multiple blowers are started at the same time. This causes a voltage drop of the power supply system of the tea factory, which causes malfunction of other equipment (control panel etc.). Or the power cable, switch, etc., generate heat. In addition, the noise level generated by the air blower is higher during startup than during normal operation, and since multiple blowers are started and operated at the same time, the noise level becomes considerable, resulting in noise pollution in the neighborhood both day and night. ing. These problems have a greater effect than in the continuous operation, particularly when the blower is intermittently operated, since the blower is turned on and off at regular intervals.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of such a background, and alleviates problems such as voltage drop, noise, and heat generation of a power supply system which occur when a blower is started or operated. It is an object of the present invention to develop a method of operating a blower in a fresh leaf management device capable of performing the method.

[0007]

According to a first aspect of the present invention, there is provided a method for operating a blower in a fresh leaf managing apparatus, wherein blowers of a plurality of blowers are positioned below a ventilation plate, and a blower provided in the blower. From the above, in the operation of the fresh leaf management device that passes air through the fresh tea leaves deposited on the air permeable plate and dissipates the respiratory heat accumulated between the fresh tea leaves to suppress a rise in the temperature of the fresh tea leaves,
The blower is started sequentially with a time lag. According to the present invention, power transmission to the blower is not concentrated at one time, so that a voltage drop in a power supply system of a tea factory can be suppressed and heat generation of a power cable and the like can be suppressed. Further, since the noise generated from the blower is not concentrated at one time, the noise level of the whole tea factory can be reduced.

According to a second aspect of the present invention, in addition to the requirement of the first aspect, the time lag is such that only a predetermined number of blowers are operated in a single blowing operation. It is characterized in that it is set so that According to the present invention, since the total current consumption of the blower in the operating state does not become excessive, the voltage drop of the power supply system can be suppressed. Further, heat generation of a power cable, a switch, and the like can be suppressed. Furthermore, the noise level can be reduced.

According to a third aspect of the present invention, in addition to the requirement of the first or second aspect, the time lag is such that at least a current consumption of a motor provided in the blower is reduced to a steady value. It is characterized by the time it takes to become. According to the present invention, the rush current particularly at the time of starting the blower is not concentrated at one time, so that the total current consumption does not become excessive and the voltage drop of the power supply system can be suppressed. Further, heat generation of a power cable, a switch, and the like can be suppressed. Furthermore, the noise level can be reduced. The problem is solved by using the configuration of the invention described in each of the claims.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of a fresh leaf managing apparatus to which the present invention is applied will be described below, and then the "operating method of a blower in a fresh leaf managing apparatus" of the present invention will be described together with the operation of the fresh leaf managing apparatus. I do. In the figure, reference numeral 1 denotes a fresh tea leaf container device, which is an example of a fresh leaf management device, for temporarily storing fresh tea leaves A while maintaining freshness, and supplying the fresh tea leaves A to a subsequent steaming step. The storage and supply of the fresh tea leaves A are collectively referred to as fresh leaf management.

As shown in FIG. 1, the raw tea leaf container device 1 has a transport frame 2, a side plate 3, a driving device 4, a blowing device 5, a scraping device 6, and a take-out conveyor with respect to a machine frame F assembled in a rectangular shape. 7 and a charging device 8 is provided above the raw tea leaf container device 1 when installed in a tea factory. Hereinafter, these various members will be schematically described.

The carrier 2 suspends a chain 22 on a pair of left and right sprockets 21 provided at a lower front portion and a lower rear portion in the longitudinal direction of the machine frame F. This is a slat conveyor configured to suspend a slat 23 serving as an air-permeable plate having a small hole 23a formed therein, and to drive the slat 23 by driving at least one of the sprockets 21 by a driving device 4 described later.

The side plate 3 is a plate-like member made of metal or the like which is raised on both sides of the carrier 2 and forms a housing 1A having an open upper surface together with the slats 23 of the carrier 2.

The drive unit 4 is provided at either the front lower part or the rear lower part of the carrier 2.
It is provided with an appropriate electric motor and a reduction gear, and transmits power to the sprocket 21 of the carrier 2.

A plurality of blowers 5 are provided for the carrier 2 and are provided with a blower cylinder 5A just below a slat 23 which is a transfer operation surface. This blower cylinder 5
Although the number of A is six in the present embodiment, it is needless to say that this number may be increased or decreased as needed, or the partition between the adjacent air blow drums 5A may be removed or opened and closed as needed. In addition, the air blower 5A can be used in such a manner as to integrate the adjacent air blow drums 5A.

A duct 5 is provided for the blower drum 5A.
C and a motor M
And a blower 5B driven by the Of course, one blower 5B takes charge of the two sections of the blower drum 5A and blows it all at once. In addition, a suitable damper or the like is used to select one of the blower drums 5A to blow the air. Can be taken. In addition, the blower 5
In addition to the air blowing, a mechanism such as a humidifying function for appropriately supplying the fresh tea leaves A with a humidifying function to feed the wet air may be added. In describing the operation of these blowers 5, the blowers 51, 52, 53, 54, 55, and 56 will be referred to in order from the discharge end side of the transport body 2 when distinguished and called.

The scraping device 6 is provided above the discharge end of the carrier 2 and has a suitable scraping mechanism such as a rotary plow.

Further, the take-out conveyor 7 uses a vibration conveyor as an example. The transfer start end of the take-out conveyor 7 faces the discharge end of the transfer body 2, and the transfer end end of the take-out conveyor 7 transfers the raw tea leaves A to a steaming step which is the next step. It is installed facing a vertical conveyor or the like for supplying.

Further, as shown in FIG. 2, for example, as shown in FIG. 2, the feeding device 8 is provided with one feeding device 8 for feeding the raw tea leaves A to the fresh tea leaf container device 1 provided with two sets. Then, it is configured such that the input action position can be selected and moved in the longitudinal direction and the width direction of the raw tea leaf container device 1 as appropriate.

A fresh tea leaf container device 1 which is an example of a fresh leaf management device to which the present invention is applied is constructed as described above. The “operating method of the blower in the fresh leaf management device” will be described. The air blowing operation described in claim 2 means a continuous air blowing operation and an intermittent air blowing operation, which will be described later, and these are also described below.

[Continuous Blowing Operation] In managing the raw tea leaves A, first, the blower 5 is started. The start of the blower 5 is performed by providing a time lag and sequentially setting the blowers 51, 52, 53, Go in the order of 54, 55, 56. This time lag is at least the time required for the consumption current of the motor M provided in the blower 51 to reach a steady value, and as shown in FIG. 4, the inrush current decreases from the maximum value Ir and becomes a steady value. After Is, the blower 52 is started after a lapse of Δt (several tens of msec), and the blowers 53, 54, 5
Start up with 5, 56. Of course, the activation of the air blower 5 is performed only for the portion located at the portion where the fresh tea leaves A are put.

Next, the raw tea leaves A are charged into the storage section 1A by the charging device 8, and the raw tea leaves A are deposited on the slats 23 in the carrier 2. At this time, the individual raw tea leaves A accumulate on the slats 23 while being exposed to the wind passing through the small holes 23a from the blower drum 5A,
Usually stacked to a height of about 110 cm. Even after the addition of the raw tea leaves A is completed, continuous blowing for about one hour is performed to lower the tea temperature as soon as possible,
The respiratory heat accumulated between the raw tea leaves A is dissipated to suppress the temperature rise of the raw tea leaves A.

[Intermittent Blowing Operation] Thereafter, when raw tea leaves A are stored in the raw tea leaf container device 1 without being processed immediately, the blower 5 is intermittently activated using a timer to blow air. For example, in the case of the best tea, 2
The operation of blowing air for 0 minutes and stopping for 40 minutes is repeated. In the case of the second and third teas, the operation of blowing air for 30 minutes and stopping for 30 minutes is repeated. The time in which the raw tea leaves A can be stored varies depending on the properties and timing of the raw tea leaves A, but is usually at most about 20 hours.
That is, during this time, the blower device 5 performs the intermittent blow operation in which the blow operation and the stop are repeated ten times or more.

The start of the blower 5 during the above-mentioned intermittent blower operation is sequentially performed by providing a time lag.
1, 52, 53, 54, 55 and 56 in this order. This time lag is set so that only one unit set in advance operates in one intermittent blow operation. Specifically, in the embodiment shown in the time chart of FIG. 5, the first tea is handled, the time lag is set to 20 minutes, and only the two blowers 5 are simultaneously operated. That is, the blower 51 is first operated for 20 minutes, and after the blower 51 is stopped, the blower 52 is operated for 20 minutes, and the blower 53 and the subsequent blowers are similarly activated sequentially with a time lag of 20 minutes. .

The blower 51 is operated for the first time (20
Minutes), when 40 minutes have elapsed, the second blowing operation is started to overlap with the start of the first blowing operation of the blowing device 54, and the two units of the blowing device 51 and the blowing device 54 operate simultaneously. become. In the above description, during the first blowing operation of the blowing device 51, since the blowing device 54 is not in the operating state, the state in which the raw tea leaves A located in the section of the blowing device 54 are not blown continues for 60 minutes. It is not preferable for the management of tea leaves A. For this reason, as shown by the broken line in FIG. 5, even at the time of the first blowing operation of the blowing device 51, the first blowing operation of the blowing device 54 is carried out so that the blowing device 51 and the blowing device 54 operate simultaneously. To do it. Similarly, the blowers 55 and 56 are simultaneously operated at the time of the first operation of the blowers 52 and 53, respectively.

In such an intermittent air blowing operation, the air blowing device 51 and the air blowing device 54 (similarly, the air blowing device 52 and the air blowing device 55, and the air blowing device 53 and the air blowing device 56, as in the above continuous air blowing operation). ) It starts sequentially with a time lag, and the time lag is at least the time required until the current consumption of the motor M provided in the blower 51 reaches a steady value.

[0027]

Other Embodiments Although the present invention is based on the above-described embodiment, the following embodiments can be adopted based on the technical idea of the present invention.
First, in the above embodiment, the management of the first tea is taken as an example.
An intermittent air blowing operation in which air is blown for 0 minutes and stopped for 40 minutes is performed so that only two blowers 5B are operated in one air blowing operation, but the number of blowers 5B which are simultaneously operated is appropriately selected. be able to.

In the above embodiment, the blowing device 5 for preventing leaf burning has been described. However, the fresh tea leaf container device 1 provided with the blowing device 5 for wetting together with the blowing device 5 for preventing leaf burning. It can also be applied to the operation of these blowers for preventing leaf burning and wetting,
It is assumed that only a predetermined number of blowers 5B are in operation in one blow operation.

In the above embodiment, the fresh tea leaf container device 1 which is a conveyor type fresh leaf management device has been described. However, the present invention can be applied to a pit type, a gauge type, or a container type fresh leaf management device. it can.

[0030]

According to the present invention, it is possible to reduce or avoid various problems such as a voltage drop of a power supply system, a noise, and a heat generation of a power supply cable, which occur when a blower is operated in a tea plant or the like.

[Brief description of the drawings]

FIG. 1 is a front view showing a raw tea leaf container device to which the present invention is applied.

FIG. 2 is a vertical sectional side view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a graph showing an operation state of a blower during a continuous blow operation by a current value.

FIG. 5 is a time chart showing an operating state of a blower during an intermittent blow operation.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 raw tea leaf container device 1A storage unit 2 carrier 3 side plate 4 drive device 5 blower device 5A blower cylinder 5B blower 5C duct 6 scraping device 7 take-out conveyor 8 feeding device 21 sprocket 22 chain 23 slat 23a small hole 51 blower device 52 blower device 52 53 Blower 54 Blower 55 Blower A Green tea leaves F Machine frame M Motor

Claims (3)

[Claims] An air blower of a plurality of air blowers is positioned below a gas permeable plate, and a blower provided in the air blower allows air to flow through the green tea leaves deposited on the air permeable plate and between the green tea leaves. In the operation of the fresh leaf managing apparatus for suppressing the temperature rise of the fresh tea leaves by dissipating the accumulated respiratory heat, the method of operating the blower in the fresh leaf managing apparatus is characterized in that the blowers are sequentially activated with a time lag. . 2. The method according to claim 1, wherein the time lag is set such that only a predetermined number of blowers are in an operating state in one blow operation. 3. The method according to claim 1, wherein the time lag is at least a time required for current consumption of a motor provided in the blower to reach a steady value. .